A prototype is a pre-production sample, model, or release of a product that is used to test a concept or process. So it is used. A prototype is an object that is associated with all functions and objects in JavaScript by default, with the prototype property of the function being accessible and editable and the prototype property of the object (aka attribute) being hidden. freeCodeCamp has an in-depth JavaScript tutorial on YouTube that will teach you all the fundamentals in just 3 hours. Some other good JavaScript tutorials: JavaScript for Cats; The Modern JavaScript Tutorial; Professor Frisbys Mostly Adequate Guide to Functional Programming; Eloquent Javascript ; Speaking Javascript; Exploring ES6 The Prototype JavaScript Framework is a JavaScript framework created by Sam Stephenson in February 2005 as part of Ajax support in Ruby on Rails. Covering popular subjects like HTML, CSS, JavaScript, Python, The new operator (configures the prototype chain on the default object returned from a constructor function),The extends keyword (configures the prototype chain when using the class syntax),Object.create will set the supplied argument as the [ [Prototype]] of the resulting object,More items The common ways to run Javascript after page load are:Add an event listener document.addEventListener ("load", FUNCTION);Add onload to the body tag Defer the script